JPH063912Y2 - Branch segment - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a branch segment used for a lining tubular wall body for lining an excavation hole to be dug when constructing a tunnel or the like. Is.

"Prior Art" Conventionally, the branching segment used for the tubular wall body for lining an excavation hole has been provided as described below. A conventional example will be described with reference to FIGS. 4 to 6.

In FIG. 4, reference numeral 1 indicates a main wall portion of the tubular wall body, and main wall portions 1, 1 are segments 2, 2 ... Connected in the circumferential direction and the axial direction of the tubular wall body. .

Reference numeral 3 indicates a branch segment that connects the main wall portions 1 and 1, and a relay plate 4 is connected between the branch segments 3 and 3. The branch segment 3 has a base 3b having a rectangular cross section whose end face 3a is connected to the intermediate plate, and a cross section branched from this base 3b and each end face 3c, 3c being connected to the main wall of the tubular wall body. It is composed of square connecting arms 3d and 3d.

A joint fitting 5b having a bolt insertion hole 5a is arranged on the joint end surfaces 3c, 3c, 3a of the connecting arm portions 3d, 3d and the connecting base portion 3b. In addition, the branch segment 6
Inside, the rectangular parallelepiped reinforcing bar cage 6 is embedded in the direction in which the connecting arm extends.

The reinforcing bar cage 6 is a rectangular parallelepiped in which the reinforcing bars are joined in a mesh shape and arranged in the vertical and horizontal directions and joined.

Joint fittings 5 embedded in the respective joint end surfaces 3c, 3c, 3a of the connecting arm portions 3d, 3d and the connecting base portion 3b,
Anchor bars 7, 7, ... Are welded to 5, ..... so as to prevent them from falling off from the branch segment 3 from their respective joint end faces toward the inside of the branch segment 3.

Then, the branching segment 3 is made by aligning the segments 2, 2, ... And the intermediate plate 4 to be joined with the joining end face, and connecting the joint fittings with each other by passing a bolt through the bolt insertion hole of the fitting body and fastening with a nut. By doing so, they are connected to each other.

In order to perform this fastening work, a space of an appropriate size is provided on the back side of the fitting main body of the segment main body.

“Problems to be solved by the invention” However, in the above-mentioned conventional technology, the segments 2, 2,
.. are connected in a cylindrical shape, and the segments 2, 2,
When there is a large external pressure such as earth pressure toward the inside in the radial direction, there are the following inconveniences. That is, when the above-mentioned pressure is applied, the branch segment 3, 3 and the cylinder 1, 1
At the joint in the circumferential direction with
A bending moment acts in the direction of the arrow M from the outer surface side to the inner surface side of the branch segment 3 with the joint portion between the and the intermediate plate 4 as the center.

In this case, the joint fittings 5 embedded in the end faces 3c and 3c of the connecting arm portions 3d and 3d of the branch segment 3 respectively.
There is a drawback in that tensile stress concentrates on the connecting arms from b, 5b via the anchor muscles 7, 7, ..., and a large load must be supported only by the connecting arms 3d, 3d.

Further, there is a drawback that the production of the reinforcing bar cage 6 embedded in the branch segment 3 is complicated and the work efficiency is poor.

[Means for Solving the Problems] Therefore, in the present invention, in order to solve the above problems, a branch segment used in a tubular wall body for lining an excavation hole is formed by a connecting arm portion and a base portion. In a branching segment that forms a substantially Y shape and in which joint fittings are provided on the joint end surfaces of the connecting arm portion and the base portion, the joint fittings provided on the joint end surfaces of the connecting arm portions are connected by a connecting member. And these as the main connecting member,
It is characterized in that a plurality of connecting members are connected to a joint fitting provided on the joint end surface of the base portion, and these connecting members are suspended on the main connecting member to form a force distribution connecting member.

"Operation" The tensile stress applied to the branch segment is transmitted to the main connecting member and the force distribution connecting member arranged inside the branch segment. That is, when a bending moment is generated from the outer surface side of the branch segment toward the inner surface side, the stress applied to both connecting arm portions of the branch segment is transmitted to the main connecting member and is pulled in both directions, so that the main connecting member The central portion tends to move away from the joint end surface of the connecting base. In response to such movement of the main connecting member, the force distributing member tries to stop the main connecting member, so that the stress is dispersed as a whole.

"Embodiment" FIGS. 1 to 3 are views showing an example of an embodiment according to the present invention. FIG. 1 is a perspective view of a branch segment according to the present invention, FIG. 2 is a front view of the branch segment as seen from the axial direction of a tubular wall body, and FIG. 3 is a side view of FIG. is there.

Reference numeral 8 denotes a branch portion segment, and the branch portion segment 8 has a rectangular connecting base portion 8b having a joint end surface 8a with the intermediate plate, and a branch wall from the connecting base portion 8b to form a main wall portion of the tubular wall body. The pair of connecting arm portions 8d and 8d having the joining end surfaces 8c and 8c to be joined together is formed into a substantially Y-shaped appearance.

Joint metal fittings 9, 9 are embedded in the joint end surfaces 8c, 8c of the pair of connecting arm portions 8d, 8d on both sides thereof.

The joint fitting 9 includes a fitting body 9a and the fitting body 9a.
It is composed of a pair of side plates (joint members) 9b, 9b fixed to both ends of the back surface of the and extending rearward. The metal fitting body 9a is formed of a rectangular steel material, and a bolt insertion hole 9c is formed near the center thereof. Connecting arm 8d, 8
Joint fittings 9 and 9 facing each other on both joint end faces 8c and 8c of d
In the side plates 9b, 9b of the connecting member 1 embedded in the connecting arm portions 8d, 8d and extending to the joint end surfaces 8c, 8c.
Both ends of 0, 10, ... Are joined by welding.
The connecting members 10, 10, ... Are main reinforcing bars made of reinforcing bars. This main rebar (connecting members 10, 10, ...)
Has a particularly excellent effect in terms of preventing the fittings 9, 9 from falling off.

In this embodiment, several reinforcing bars are used as the connecting members for the joint fittings, but more reinforcing bars may be used.

Next, a joint fitting 9 provided on the joint end surface 8a of the joint base 8b and a joint member 11 joined to the joint joint 9,
11, ... will be described.

The joint fitting 9 provided on the base portion 8b is provided on both the connecting arm portions 8
It has the same structure as the joint fitting 9 provided on d and 8d, and is provided in a state of being buried near the four corners of the joint end surface 8a of the base portion 8b. The side plates 9b, 9 of this joint fitting 9
Connection members 11, 11, ... Are welded to b.
The connecting members 11, 11, ... Are the connecting members 10, 1.
It is arranged so that it is suspended at 0, .... These connecting members 11, 11, ... Are force distribution reinforcing bars made of reinforcing bars.

The branch segment 8 configured as described above has the following advantages with respect to the external pressure as described in the above-mentioned problem part.

First, in the circumferential direction of the branch segment 8 and the main wall 1, the bending moment is increased from the outer surface side of the branch segment 8 to the inner surface around the joint between the branch segment 8 and the intermediate plate 4. Occurs. In the past, this bending moment was applied only to the joint fittings provided on the connecting arms, resulting in stress concentration. However, in the case of the branch segment 8 of the present invention, the stress is dispersed by the action of the main reinforcing bar (connecting member 10) and the force distributing bar (connecting member 11).

The form of stress dispersion is shown below. First, the fitting 9
Is transmitted to the main reinforcing bar (connecting member 10) and is pulled in both directions, and the vicinity of the central part of the main reinforcing bar (connecting member 10) tends to move away from the joint end surface 8a of the connecting base 8b. . In order to stop the motion of the main reinforcing bar (connecting member 10) by the action of the distribution muscle (connecting member 11) acting on such motion near the central portion of the main reinforcing bar,
The stress is distributed as a whole.

[Advantage of Invention] According to this invention, the joint fittings provided at the joints of both joint arms of the branch segment are joined by the joint member to form the main joint member, and further, at the joint of the joint base. Since the connecting member extending from the provided joint fitting is suspended on the main connecting member, the load applied to the joint fitting is dispersed in the branch segment through the connecting member, and stress concentration can be prevented. At the same time, it is possible to eliminate the possibility that the fittings will fall off.

Further, since it is not necessary to manufacture a reinforcing bar cage, complicated working steps can be omitted, and the working efficiency can be improved.

[Brief description of drawings]

1 to 3 are views showing an embodiment according to the present invention. FIG. 1 is a perspective view of a branch segment, FIG. 2 is a front view seen from the axial side of a tubular wall, and FIG. FIG. 3 is a side view of FIG. FIG. 4 to FIG. 6 are views showing an example of the prior art, FIG. 4 is a front view of the tubular wall body as seen from the axial direction, and FIG. 5 is a branch segment as seen from the axial direction of the tubular wall body. 6 is a front view and FIG. 6 is a side view of FIG. 1 ... Main wall part, 2 ... Segment, 3, 8 ... Branch part segment, 3b, 8b ... Connection base part, 3d, 8d ... Connection arm part, 4 ... Intermediary plate, 5b ... Joint fitting, 6 ... Reinforcing bar cage, 7 ... Anchor bar, 9 ... Joint fitting, 10, 11 ... Connecting member.

Claims (1)

[Scope of utility model registration request] 1. A branching segment used for a tubular wall for lining an excavation hole, the segment being approximately Y by a connecting arm and a base.
In a branching segment that forms a shape and in which a joint fitting is provided on the joint end surfaces of the connecting arm portion and the base portion, the joint fittings provided on the joint end surfaces of the connecting arm portions are connected by a connecting member. These are the main connecting members,
A branch segment, wherein connecting members are connected to joint fittings provided on the joint end surface of the base portion, and these connecting members are suspended on the main connecting member to form a force distribution connecting member.